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We perform a thorough analysis of the spectral statistics of experimentalmolecular resonances, of bosonic erbium $^{166}$Er and $^{168}$Er isotopes,produced as a function of magnetic field($B$) by Frisch et al. [Nature 507,(2014) 475], utilizing some recently derived surmises which interpolate betweenPoisson and GOE and without unfolding. Supplementing this with an analysisusing unfolded spectrum, it is shown that the resonances are close tosemi-Poisson distribution. There is an earlier claim of missing resonances byMolina et al. [Phys. Rev. E 92, (2015) 042906]. These two interpretations canbe tested by more precise measurements in future experiments.

Spectral analysis of molecular resonances in erbium isotopes: Are they close to semi-Poisson?